Blade assembly and air conditioner having the same

ABSTRACT

An air conditioner includes a housing forming an external appearance of the air conditioner and provided with an air discharge port forming an air discharge flow path allowing air inside of the housing to be discharged therethrough, a blade arranged at the air discharge port to control a flow direction of the air discharged from the air discharge port, and a blade reinforcement support arranged on the blade to prevent bending of the blade, wherein the blade reinforcement support includes a blade support having a support protrusion provided with a shaft hole parallel with the blade, and a seating portion comprising a seating protrusion inserted into the shaft hole to allow rotation of the support protrusion, and a seating guide to surround an outer circumferential surface of the support protrusion. Thereby, the blade may have an enhanced fastening strength and be stably supported.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No. 10-2013-0039970, filed on Apr. 11, 2013 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.

BACKGROUND

1. Field

One or more embodiments relate to a blade assembly having an improved fastening structure of blades and an air conditioner having the same,

2. Description of the Related Art

An air conditioner generally uses a refrigeration cycle to adjust temperature, humidity, airflow direction, and air distribution and to remove dust from the air to provide an environment suitable for humans. Main constituents configuring the refrigeration cycle include a compressor, a condenser, an evaporator, and a fan.

An air conditioner having an indoor unit and an outdoor unit separately installed is referred to as a split type air conditioner. An air conditioner having an indoor unit and an outdoor unit installed together in one cabinet is referred to as an integrated type air conditioner.

The air conditioner includes a housing forming an external appearance of the air conditioner, a suction port housing formed on the front surface of the housing to suction in indoor air, and a discharge port formed at the lower portion of the housing to discharge cooled or heated air therethrough.

A blade to control the air flow direction is provided at the discharge port. Since the blade has a greater length than width, the blade may be deformed, separated from the air conditioner, or damaged when the air conditioner is moved or when the blade sags due to gravity.

SUMMARY

The foregoing described problems may be overcome and/or other aspects may be achieved by one or more embodiments of a blade assembly which has an improved fastening structure by enhancing the fastening strength of the blade and an air conditioner having the same.

Additional aspects and/or advantages of one or more embodiments will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of one or more embodiments of disclosure. One or more embodiments are inclusive of such additional aspects.

In accordance with one or more embodiments, an air conditioner may include a housing forming an external appearance of the air conditioner and that may be provided with an air discharge port forming an air discharge flow path allowing air inside of the housing to be discharged therethrough, a blade that may be arranged at the air discharge port to control a flow direction of the air discharged from the air discharge port, and a blade reinforcement support that may be arranged on the blade to possibly prevent bending of the blade, wherein the blade reinforcement support may include a blade support that may have a support protrusion provided with a shaft hole parallel with the blade, and a seating portion that may comprise a seating protrusion inserted into the shaft hole to allow rotation of the support protrusion, and a seating guide to surround an outer circumferential surface of the support protrusion.

The blade may include a blade end provided with a rotating shaft to rotate, and a blade lateral surface portion to control flow of air discharged from the blade end, wherein the blade reinforcement support may be arranged at the blade lateral surface portion.

The blade support may include a support arm extending from an outer surface of the support protrusion and connected to the blade.

The support arm may be formed to extend from the outer surface of the support protrusion and to be perpendicular to the shaft hole.

The support protrusion may extend in an axial direction to have a first length such that an inner circumferential surface of the support protrusion is supported by the seating protrusion and the outer circumferential surface of the support protrusion is supported by the seating guide.

The seating protrusion may be formed in a shape of a rod having a circular cross section, and may be arranged through the shaft hole to protrude from an end of the support protrusion.

The seating portion may include a hinge member coupled to the air discharge port to support the seating protrusion and the seating guide.

The support protrusion, the seating protrusion and the seating guide may be concentrically formed.

A width of the support arm may increase as the support arm extends from the support protrusion to the blade.

The seating portion may include a stopper protruding from an end of the seating guide to limit rotation of the blade support.

In accordance with or more embodiments, an air conditioner may include a housing forming an external appearance of the air conditioner and that may be provided with an air discharge port forming an air discharge flow path allowing air inside of the housing to be discharged therethrough, a blade arranged at the air discharge port to control a flow direction of the air discharged from the air discharge port, a seating portion comprising a seating protrusion arranged to be parallel with the blade, and a seating guide concentrically spaced apart from the seating protrusion to form a first space with an annular shape between the seating guide and the seating protrusion, the seating portion being arranged at the air discharge port to support the blade, and a blade support extending from the blade such that at least one portion thereof is inserted into the first space to support rotation of the blade.

The blade support may include a support protrusion provided with a shaft hole to be seated in the first space, and a support arm extending from an outer surface of the support protrusion and connected to the blade.

The support protrusion may extend in an axial direction to have a first length such that an inner circumferential surface of the support protrusion is supported by the seating protrusion and the outer circumferential surface of the support protrusion is supported by the seating guide.

The support arm may be arranged to be perpendicular to an axial direction of the support protrusion.

The seating portion may include a hinge member arranged at the air discharge port and adapted to support the seating protrusion and the seating guide.

The support protrusion, the seating protrusion and the seating guide are concentrically formed.

In accordance with or more embodiments, a blade assembly including an air discharge port forming an air discharge flow path may include a blade to control a flow direction of air discharged from the air discharge port, and a blade reinforcement support to support the blade at the air discharge port to possibly prevent bending of the blade, wherein the blade reinforcement support may include a support arm provided at one end of the blade reinforcement support to be supported against the blade, a hinge member provided at the other end of the blade reinforcement support to be supported against the air discharge port, a support protrusion arranged at the support arm to form a center of rotation of the blade and provided with a shaft hole parallel with the blade, a seating protrusion arranged on the hinge member and protruding to penetrate the shaft hole to allow rotation of the support protrusion, and a seating guide concentrically spaced apart from the seating protrusion to form a first annular space between the seating guide and the seating protrusion.

The support protrusion may extend in an axial direction to have a first length such that an inner circumferential surface of the support protrusion is supported by the seating protrusion and the outer circumferential surface of the support protrusion is supported by the seating guide.

The support protrusion, the seating protrusion and the seating guide are concentrically formed.

The blade assembly may further include a reinforcement protrusion protruding from a lateral surface of each of the support arm and the hinge member and extending from the support protrusion to the blade and from the seating guide to the air discharge port.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readily appreciated from the following description of embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a view showing an indoor unit of an air conditioner according to one or more embodiments;

FIG. 2 is a cross-sectional view showing an air conditioner according to one or more embodiments, such as the air conditioner of FIG. 1, taken along line A-A′ in FIG. 1;

FIG. 3 is a cross-sectional view showing an air conditioner according to one or more embodiments, such as the air conditioner of FIG. 1, taken along line B-B′ in FIG. 1;

FIG. 4 is a view showing a blade assembly according to one or more embodiments;

FIG. 5 is an exploded perspective view showing a blade assembly according to one or more embodiments, such as the blade assembly of FIG. 4;

FIG. 6 is a view showing a seating portion of a blade assembly according to one or more embodiments, such as the blade assembly of FIG. 4;

FIG. 7 is a cross-sectional view showing a blade assembly according to one or more embodiments; and

FIG. 8 is a view illustrating distribution of external force applied to a blade assembly according to one or more embodiments, such as the blade assembly of FIG. 7.

DETAILED DESCRIPTION

Reference will now be made in detail to one or more embodiments, illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, embodiments of the present invention may be embodied in many different forms and should not be construed as being limited to embodiments set forth herein, as various changes, modifications, and equivalents of the systems, apparatuses and/or methods described herein will be understood to be included in the invention by those of ordinary skill in the art after embodiments discussed herein are understood. Accordingly, embodiments are merely described below, by referring to the figures, to explain aspects of the present invention.

FIG. 1 is a view showing an indoor unit of an air conditioner according to one or more embodiments, FIG. 2 is a cross-sectional view showing an air conditioner according to one or more embodiments, such as the air conditioner of FIG. 1, taken along line A-A′ in FIG. 1, and FIG. 3 is a cross-sectional view showing an air conditioner according to one or more embodiments, such as the air conditioner of FIG. 1, taken along line B-B′ in FIG. 1.

The indoor unit may be provided with a case 10 forming an external appearance of the indoor unit. A suction port 11 may be formed on the upper front surface of the case 10 to suction in the indoor air. An air discharge port 12 may be formed at a lower portion of the case 10 to discharge cooled or heated air to the indoor space.

The air discharge port 12 may be provided with a blade 30 to adjust the direction of air discharged from the case 10 to the indoor space.

Mounted to one side of the lateral surface of the blade 30 may be a motor (not shown) to supply power to rotate the blade 30. The blade 30 may be vertically rotated by the motor (not shown) to adjust the airflow direction.

Installed in the case 10 may be a fan 22 to generate suction force to suction in the indoor air, and a heat exchanger 20 adapted to exchange heat with the suctioned indoor air to cool or heat the indoor air.

A rear guide 24 forming a flow path of the discharged air may be installed at the front of the fan.

Accordingly, when the fan 22 rotates, the air may be suctioned into the case 10 through the suction port 11. The suctioned air may be cooled or heated while passing through the heat exchanger 20, and then may be guided to the discharge port by the rear guide 24 and discharged to the indoor space through the discharge port 12.

At this time, the discharge direction of the discharged air may be adjusted by the blade 30 installed at the discharge port 12.

The blade 30 may be installed to correspond to the discharge port 12 formed to horizontally extend from the lower side of the case 10. Since the blade may be long, it may bend or sag due to gravity during rotation. In addition, in the case that external force is applied to the blade 30 while the air conditioner is moved, the blade 30 may be damaged.

Therefore, to possibly prevent occurrence of the above events, the blade 30 may be provided with a blade reinforcement support 100, which may be arranged at the air discharge port 12 to support the blade 30.

FIG. 4 is a view showing a blade assembly according to one or more embodiments. FIG. 5 is an exploded perspective view showing a blade assembly according to one or more embodiments, such as the blade assembly of FIG. 4. FIG. 6 is a view showing a seating portion of a blade assembly according to one or more embodiments, such as the blade assembly of FIG. 4. FIG. 7 is a cross-sectional view showing a blade assembly according to one or more embodiments.

The air conditioner may include a blade 30 arranged at the air discharge port 12 to control the flow direction of the air discharged from air discharge port 12, and a blade reinforcement support 100 provided on the blade 30 to possibly prevent bending of the blade 30.

As described above, the blade 30 may be provided at the air discharge port 12 to control flow of the air discharged from the air discharge port 12.

The blade 30 may be formed in the shape of a plate, the length of which is greater than the width. The blade 30 may include blade ends 30 a provided at both end portions thereof with a rotating shaft connected to a motor (not shown) to rotate, and a blade lateral surface portion 30 b disposed between the blade ends 30 a to control the flow of discharged air.

The blade 30 may be provided at an end thereof with a blade rotating portion 32. The blade rotating portion 32 may receive rotational force from the motor (not shown) arranged at the outer side of the air discharge port 12 to rotate the blade 30.

The blade reinforcement support 100, which may be provided at the blade 30, may prevent bending of the blade 30 and may enhance durability of the blade 30.

The blade reinforcement support 100 may alternatively be provided at a blade rotating shaft 32 a, which may function as the rotation axis of the blade 30. In the illustrated embodiment, at least one blade reinforcement support 100 may be provided in the longitudinal direction of the blade 30. Specifically, at least one blade reinforcement support 100 may be provided at the lateral surface portion of the blade 30.

The blade reinforcement support 100 may include the blade support 110 arranged in the longitudinal direction of the blade 30 to support the blade 30, and a seating portion 120 supported against the air discharge port 12 to support the blade support 110.

The blade support 110 may include a support protrusion 112 provided with a shaft hole 112 a parallel to the blade 30, and a support arm 114 to support the support protrusion 112 at the blade 30.

The support protrusion 112 may be formed in a cylindrical shape and may be provided with a shaft hole 112 a in the axial direction thereof. Thereby, the cross section of the support protrusion 112 may have an annular shape. The inner circumferential surface of the support protrusion 112 may be supported by a seating protrusion 122, which will be described later. The outer circumferential surface of the support protrusion 112 may have a first length L1 in the axial direction to be supported by a seating guide 124. The first length L1 is not limited and may be any length so long as it allows the seating protrusion 122 to protrude through the shaft hole 112 a of the support protrusion 112 and allows the seating guide 124 to support the outer circumferential surface of the support protrusion 112.

The support arm 114, which may allow the support protrusion 112 to be supported against the blade 30, may extend from the outer circumferential surface of the support protrusion 112 to be connected to the blade 30. The support arm 114 may be adapted to support the support protrusion 112, and may be arranged in a direction perpendicular to the axial direction of the support protrusion 112 for support of the blade 30 against external force applied to the blade 30 and rotation of the blade 30.

The width of the support arm 114 may increase as the support arm 114 extends from the support protrusion 112 to the blade lateral surface portion 30 b. While the support arm 114 is illustrated as having an increasing width, it may have any shape so long as the support protrusion 112 is stably supported by the blade 30.

When the blade support 110 is coupled to the seating portion 120, the support arm 114 may be disposed at the upper edge of the end of the seating guide 124 to transfer rotation of the blade 30 to the support protrusion 112 and to possibly avoid interfering with the seating guide 124 in supporting the outer circumferential surface of the support protrusion 112.

The seating portion 120 may allow the blade support 110 to be seated thereon to possibly enhance durability of the blade support 110 and possibly ensure stable support.

The seating portion 120 may include a hinge member 128 protruding from the air discharge port 12.

The hinge member 128 may be adapted to support the seating protrusion 122 and the seating guide 124. The hinge member 128 may be arranged in the flow path of the air to extend in the air discharge direction for efficient discharge of the air discharged toward the air discharge port 12.

The seating portion 120 may include a seating protrusion 122 allowing the blade support 110 to rotate, and a seating guide 124 adapted to surround the outer circumferential surface of the support protrusion 112. The seating portion 120 may further include a seating bottom 126 allowing the seating protrusion 122 and the seating guide 124 to be disposed thereon and extending from the hinge member 128.

The seating protrusion 122, which may protrude from the seating bottom 126, may be arranged through the shaft hole 112 a of the support protrusion 112 to protrude from the end of the support protrusion 112. While the seating protrusion 122 is illustrated as being arranged through the shaft hole 112 a to protrude from the end of the support protrusion 112, the seating protrusion 122 may be differently arranged so along as the seating protrusion 122 is inserted into the shaft hole 112 a. That is, the seating protrusion 122 may be shorter than the support protrusion 112 and thus the end of the seating protrusion 122 may be disposed in the shaft hole 112 a. The seating protrusion 122 may function as the rotating shaft forming the rotation axis of the support protrusion 112, and the inner circumferential surface of the support protrusion 112 may closely contact the outer circumferential surface of the seating protrusion 122.

The seating protrusion 122 may have a different shape so long as it supports the inner circumferential surface of the support protrusion 112 and functions as the rotating shaft of the support protrusion 112. The seating protrusion 122 may alternatively be formed, for example, in the shape of a cylindrical shaft having a circular cross section. In the illustrated embodiment, the seating protrusion 122 is formed in the shape of a cylindrical shaft having a hollow portion in addition to the seating bottom 126, but is not limited thereto.

The seating guide 124, which may protrude from the seating bottom 126, may be concentrically spaced apart from the seating protrusion 122 such that a first annular space S1 is formed between the seating guide 124 and the seating protrusion 122 and that the seating guide 124 closely contacts the support protrusion 112 to surround the outer circumferential surface of the support protrusion 112.

The first annular space S1, between the seating protrusion 122 and the seating guide 124, may allow the support protrusion 112 having an annular cross section to be inserted thereinto such that the inner circumferential surface and outer circumferential surface of the support protrusion 112 are supported.

The support arm 114 may be provided on the lateral surface thereof with a reinforcement protrusion 130 formed to extend from the blade 30 to the support protrusion 112 and protrude from the lateral surface. The hinge member 128 may be provided on the lateral surface thereof with a reinforcement protrusion 130 formed to extend from the air discharge port to the seating portion 120 and protrude from the lateral surface.

At least one reinforcement protrusion 130 may be provided to support the lateral surfaces of the support arm 114 and the hinge member 128 to possibly enhance durability of the support arm 114 and the hinge member 128.

A stopper 125 extending in the axial direction of the seating guide 124 may be provided at the end of the seating guide 124 to limit rotation of the blade support 110.

The stopper 125 may be formed to expand by a first angle A1 about the seating guide 124 in the circumferential direction to limit rotation of the blade support 110 at the end of the seating guide 124, specifically the movement of the side end of the support arm 114 in opening and closing the blade 30.

The first angle A1 may be an angle which does interfere with the range of the axial rotation of the support art 114 at the upper end of the seating guide 124 in which the blade 30 is opened or closed.

Hereinafter, operation of a blade assembly configured as above and an air conditioner having the same will be described.

A description will first be given of operation of the blade assembly. When the air conditioner is turned on, the blade 30 closing the flow path in the air discharge port 12 may rotate to open the flow path.

The blade support 110 coupled to the seating protrusion 122 and the seating guide 124 provided on the hinge member 128 may axially rotate with respect to the seating protrusion 122 and the seating guide 124. Specifically, the support protrusion 112 of the blade support 110 may rotate between the seating protrusion 122 of the seating portion 120 and the seating guide 124 to support the blade lateral surface portion 30 b.

Next, a description will be given of the case in which external force is applied to the blade assembly with reference to FIG. 8. FIG. 8 is a view illustrating distribution of external force applied to a blade assembly according to one or more embodiments, such as the blade assembly of FIG. 7.

When an external force F1 is applied to the blade 30 as shown in FIG. 8, the applied force may be transferred to the blade reinforcement support 100. Specifically, the applied force may be transferred to the support protrusion 112 via the support arm 114.

In the air conditioner, the constituent part that may support the lateral surface of the blade 30 may function as the rotation center of the blade 30 and may have a smaller cross-section than other portions. Thereby, it may be subjected to concentrated stress. Accordingly, it may be subjected to a larger pressure than the other constituent parts when force is applied, and therefore the durability thereof may be lowered.

In the case of the blade reinforcement support 100 of this embodiment, the external force F1 transferred to the support protrusion 112 may be distributed to the outer circumferential surface of the seating protrusion 122 supporting the inner circumferential surface of the support protrusion 112 and the inner circumferential surface of the seating guide 124 supporting the outer circumferential surface of the support protrusion 112 (F2, F3). Thereby, concentration of stress may be reduced. In addition, the support protrusion 112, the seating protrusion 122 and the seating guide 124 may be disposed in a direction perpendicular to the direction in which the external force F1 is applied. Accordingly, the outer surfaces of the support protrusion 112, the seating protrusion 122 and the seating guide 124 formed in the axial direction may receive the external force F1 applied thereto and distribute the external force F1 through the outer surfaces (F2, F3). Therefore, the blade 30 may be more stably supported. Reference symbols F2 and F3 respectively represent the forces produced by the outer circumferential surface of the seating protrusion 122 and the inner circumferential surface of the seating guide 124 to support the blade 30 when external force F1 is applied.

As is apparent from the above description, a blade assembly and an air conditioner having the same according to one or more embodiments may improve fastening strength of a blade, thereby possibly enhancing durability of a blade against external force and possibly preventing separation of the blade caused by bending of the blade.

While aspects of the present invention have been particularly shown and described with reference to differing embodiments thereof, it should be understood that these embodiments should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in the remaining embodiments. Suitable results may equally be achieved if the described techniques are performed in a different order and/or if components in a described system, architecture, device, or circuit are combined in a different manner and/or replaced or supplemented by other components or their equivalents.

Thus, although a few embodiments have been shown and described, with additional embodiments being equally available, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents. 

What is claimed is:
 1. An air conditioner comprising: a housing forming an external appearance of the air conditioner and provided with an air discharge port forming an air discharge flow path allowing air inside of the housing to be discharged therethrough; a blade arranged at the air discharge port to control a flow direction of the air discharged from the air discharge port; and a blade reinforcement support arranged on the blade, wherein the blade reinforcement support comprises: a blade support having a support protrusion provided with a shaft hole parallel with the blade; and a seating portion comprising a seating protrusion inserted into the shaft hole to allow rotation of the support protrusion, and a seating guide to surround an outer circumferential surface of the support protrusion.
 2. The air conditioner according to claim 1, wherein the blade comprises: a blade end provided with a rotating shaft to rotate; and a blade lateral surface portion to control flow of air discharged from the blade end, wherein the blade reinforcement support is arranged at the blade lateral surface portion.
 3. The air conditioner according to claim 1, wherein the blade support comprises a support arm extending from an outer surface of the support protrusion and connected to the blade.
 4. The air conditioner according to claim 3, wherein the support arm is formed to extend from the outer surface of the support protrusion and to be perpendicular to the shaft hole.
 5. The air conditioner according to claim 1, wherein the support protrusion extends in an axial direction to have a first length such that an inner circumferential surface of the support protrusion is supported by the seating protrusion and the outer circumferential surface of the support protrusion is supported by the seating guide.
 6. The air conditioner according to claim 1, wherein the seating protrusion is formed in a shape of a rod having a circular cross section, and is arranged through the shaft hole to protrude from an end of the support protrusion.
 7. The air conditioner according to claim 1, wherein the seating protrusion is formed in a shape of a rod having a circular cross section, and an end of the seating protrusion is disposed in the shaft hole.
 8. The air conditioner according to claim 1, wherein the seating portion comprises a hinge member coupled to the air discharge port to support the seating protrusion and the seating guide.
 9. The air conditioner according to claim 1, wherein the support protrusion, the seating protrusion and the seating guide are concentrically formed.
 10. The air conditioner according to claim 1, wherein a width of the support arm increases as the support arm extends from the support protrusion to the blade.
 11. The air conditioner according to claim 1, wherein the seating portion comprises a stopper protruding from an end of the seating guide to limit rotation of the blade support.
 12. An air conditioner comprising: a housing forming an external appearance of the air conditioner and provided with an air discharge port forming an air discharge flow path allowing air inside of the housing to be discharged therethrough; a blade arranged at the air discharge port to control a flow direction of the air discharged from the air discharge port; a seating portion comprising a seating protrusion arranged to be parallel with the blade, and a seating guide concentrically spaced apart from the seating protrusion to form a first space with an annular shape between the seating guide and the seating protrusion, the seating portion being arranged at the air discharge port to support the blade; and a blade support extending from the blade such that at least one portion thereof is inserted into the first space to support rotation of the blade.
 13. The air conditioner according to claim 12, wherein the blade support comprises: a support protrusion provided with a shaft hole to be seated in the first space; and a support arm extending from an outer surface of the support protrusion and connected to the blade.
 14. The air conditioner according to claim 12, wherein the support protrusion extends in an axial direction to have a first length such that an inner circumferential surface of the support protrusion is supported by the seating protrusion and the outer circumferential surface of the support protrusion is supported by the seating guide.
 15. The air conditioner according to claim 12, wherein the support arm is arranged to be perpendicular to an axial direction of the support protrusion.
 16. The air conditioner according to claim 12, wherein the seating portion comprises a hinge member arranged at the air discharge port and adapted to support the seating protrusion and the seating guide.
 17. The air conditioner according to claim 12, wherein the support protrusion, the seating protrusion and the seating guide are concentrically formed.
 18. A blade assembly including an air discharge port forming an air discharge flow path comprising: a blade to control a flow direction of air discharged from the air discharge port; and a blade reinforcement support to support the blade at the air discharge port to prevent bending of the blade, wherein the blade reinforcement support comprises: a support arm provided at one end of the blade reinforcement support to be supported against the blade; a hinge member provided at the other end of the blade reinforcement support to be supported against the air discharge port; a support protrusion arranged at the support arm to form a center of rotation of the blade and provided with a shaft hole parallel with the blade; a seating protrusion arranged on the hinge member and protruding to penetrate the shaft hole to allow rotation of the support protrusion; and a seating guide concentrically spaced apart from the seating protrusion to form a first space with an annular shape between the seating guide and the seating protrusion.
 19. The blade assembly according to claim 18, wherein the support protrusion extends in an axial direction to have a first length such that an inner circumferential surface of the support protrusion is supported by the seating protrusion and the outer circumferential surface of the support protrusion is supported by the seating guide.
 20. The blade assembly according to claim 18, wherein the support protrusion, the seating protrusion and the seating guide are concentrically formed.
 21. The blade assembly according to claim 18, further comprising a reinforcement protrusion protruding from a lateral surface of each of the support arm and the hinge member and extending from the support protrusion to the blade and from the seating guide to the air discharge port.
 22. A blade assembly including an air discharge port forming an air discharge flow path comprising: a blade to control a flow direction of air discharged from the air discharge port; and a blade reinforcement support to support the blade at the air discharge port to prevent bending of the blade, wherein the blade reinforcement support comprises: a blade support; and a seating portion rotatably connected to the blade support;
 23. The blade assembly according to claim 22, wherein: the blade support comprises: a support arm provided at one end of the blade reinforcement support to be supported against the blade; and a support protrusion arranged at the support arm to form a center of rotation of the blade and provided with a shaft hole parallel with the blade; and the seating portion comprises: a hinge member provided at the other end of the blade reinforcement support to be supported against the air discharge port; a seating protrusion arranged on the hinge member and protruding to penetrate the shaft hole to allow rotation of the support protrusion; and a seating guide concentrically spaced apart from the seating protrusion to form a first space with an annular shape between the seating guide and the seating protrusion.
 24. The blade assembly according to claim 23, wherein the support protrusion extends in an axial direction to have a first length such that an inner circumferential surface of the support protrusion is supported by the seating protrusion and the outer circumferential surface of the support protrusion is supported by the seating guide.
 25. The blade assembly according to claim 23, wherein the support protrusion, the seating protrusion and the seating guide are concentrically formed.
 26. The blade assembly according to claim 23, further comprising a reinforcement protrusion protruding from a lateral surface of each of the support arm and the hinge member and extending from the support protrusion to the blade and from the seating guide to the air discharge port. 